Weather 12-18-19


The ridge of high pressure continues to bend down this morning a huge upper level low begins to move into the Eastern Pacific. Weather for the most part today will be quiet ahead of the storm system with cloudy skies and a 30% chance of snow by late this afternoon, highs in the lower 30’s.

A strong winter storm system will bring a variety of precipitation to the entire region tonight through the rest of the week. The well-advertised winter storm will move through in two parts. The first weaker wave will move into Northcentral Washington tonight and be east of the area by Thursday night. As mentioned in previous discussions, an atmospheric river will be pointed right at the Pacific Northwest increasing the moisture to well over 200% of normal. So, for tonight, precipitation will be a wintry mix with snow, rain, and pockets of freezing rain expected. An inch or two of snow will be possible for the lower elevations, with 3-7 inches in the Cascades. Add in light freezing rain and the travel impacts will be high.

A Winter Storm Watch will go into effect tonight and run through Friday morning for Northcentral Washington. For Thursday, snow is likely until early afternoon and then changes over to rain as a warm front slides through with highs in the mid 30’s.

For Friday, the leading edge of the river of moisture will send warm and very wet weather our way with an 80% chance of rain and afternoon high temperatures in the upper 30’s to lower 40’s.

Rain likely Saturday morning as well with mostly cloudy skies by afternoon with afternoon highs still mild near 40 degrees.

Mostly cloudy with a few showers Sunday, highs in the upper 30’s. Monday and Tuesday appear quite benign in comparison to this week’s weather with mostly sunny skies and afternoon high temperatures in the mid to upper 30’s.